Fears grew Sunday of heavy casualties in South Sudan's Jonglei state following more than a week of bitter tribal fighting, after the UN reported at least 200 wounded were found in just one village alone.

"Some 200 casualties have arrived in Manyabol", a remote village in the troubled eastern state of Jonglei, where militia gunmen from rival ethnic groups have been battling, said Toby Lanzer, the top United Nations humanitarian official in the country said.

Manyabol is only one settlement in a vast region affected by the fighting, fuelling concerns that the number injured or killed elsewhere in the impoverished state could be far higher.

No figures were given on any possible deaths, but Lanzer called on leaders "urgently to halt the cycle of violence that is leading to senseless loss of life and suffering amongst civilians."

Previous such attacks in the conflict-wracked region have seen hundreds, and possibly thousands, of civilians killed.

The UN were airlifting the most critically injured to Jonglei's state capital Bor for medical treatment, where Doctors Without Borders (MSF - Medecins Sans Frontieres) are supporting the basic hospital.

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